feat(radio): support for color binding

[devversion]

• Introduces the color binding for radio buttons. By default every selection control uses accent as per Material design specifications.

Closes #4677

[tinayuangao]

LGTM

[chriszrc]

💯
Nice!!! Seems this hasn't made it to the docs though :'(

[devversion]

@chriszrc Sorry for that. Since the color, tabIndex, rippleDisabled properties are mostly created by mixin functions to reduce the payload of Angular Material.. those aren't showing up in the API docs (yet).

We definitely want to fix that, but our docs generation tool is not yet able to understand such mixins, because it kind of isn't statically analyzable. Tracking this issue with #5284

[angular-automatic-lock-bot]

This issue has been automatically locked due to inactivity.
Please file a new issue if you are encountering a similar or related problem.

Read more about our automatic conversation locking policy.

_{This action has been performed automatically by a bot.}